Fail to import 'ClassificationOptions' from 'ibm_watson.natural_language_understanding_v1' in py3.7

[Fred-Fan]

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Overview I am trying the APIs for NLU using ibm_watson. However, the below import works in python 3.9 but failed in python 3.7

from ibm_watson.natural_language_understanding_v1 import ClassificationOptions

Expected behavior The component can be imported successfully

Actual behavior I got an error below:

Python 3.7.12 (default, Mar 23 2022, 17:57:27) 
[Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ibm_watson
>>> ibm_watson.__version__
'6.1.0'
>>> from ibm_watson.natural_language_understanding_v1 import ClassificationOptions
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'ClassificationOptions' from 'ibm_watson.natural_language_understanding_v1' (/Users/xuanchengfan/.pyenv/versions/3.7.12/lib/python3.7/site-packages/ibm_watson/natural_language_understanding_v1.py)
>>> 

How to reproduce

import ibm_watson
from ibm_watson.natural_language_understanding_v1 import ClassificationOptions

Screenshots If applicable, add screenshots to help explain your problem.

SDK Version '6.1.0'

Additional information:

• OS: macOS 13.0.1
• Which version of Python are you using? 3.7

Additional context my IBM email: xuancheng.fan@ibm.com